Date Object Understanding

1 
const photoGallery = (title, dimensions, date) => {
    return {
      title,
      dimensions,
      date,
      info() {
        console.log(
          `Dimenstions of the photo ${this.title} are ${this.dimensions}`
        );
      },
      publishInfo: () => {
        console.log(
          `Foto was published ${Math.floor(
            (new Date().getTime() - date.getTime()) / 1000
          )} seconds ago`
        );
    }
  }
}
  
  const photo1 = photoGallery(
    "My dog",
    "1920x1080",
    new Date()
  );
  
 
  photo1.info();
  /* Dimenstions of the foto "My dog" are 1920x1080 */
  
  setTimeout(() => photo1.publishInfo(), 2000);
  /* Foto "My dog" was published 2 seconds ago */

Not understanding how setTimeout function is working here.
If I call photo1.publishinfo() again in the console I get updated seconds, how?